Most magic practicing groups believe the last step to casting any spell successfully is to forget about it. Ask anyone who casts and most will tell you this is the hardest part. (this also varies form spell to spell)

I didn't see the spell that you linked to, but in general servitor creation is the process through which one creates a servant spirit. It is not a tangible, visible creation in the physical sense, but a thing quite along the with the nature of other spirits.

I posted something about their creation here:
http://www.spellsofmagic.com/read_post.html?post=549432